From da61dd28c6dd77901058580e391cb8c88bb506f2 Mon Sep 17 00:00:00 2001 From: Alexey Samsonov Date: Mon, 17 Nov 2025 15:43:42 -0800 Subject: [libc] Move mbtowc, mbstowcs and inverse functions to stdlib.h (#168455) These functions should be declared in `stdlib.h`, not `wchar.h`, as confusing as it is. Move them to the proper header file and matching directories in src/ and test/ trees. This was discovered while testing libc++ build against llvm-libc, which re-declares functions like mbtowc in std-namespace in `` header, and then uses those functions in its locale implementation. --- libc/src/stdlib/wcstombs.cpp | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 libc/src/stdlib/wcstombs.cpp (limited to 'libc/src/stdlib/wcstombs.cpp') diff --git a/libc/src/stdlib/wcstombs.cpp b/libc/src/stdlib/wcstombs.cpp new file mode 100644 index 000000000000..712af958456d --- /dev/null +++ b/libc/src/stdlib/wcstombs.cpp @@ -0,0 +1,38 @@ +//===-- Implementation of wcstombs ----------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "src/stdlib/wcstombs.h" + +#include "hdr/types/char32_t.h" +#include "hdr/types/size_t.h" +#include "hdr/types/wchar_t.h" +#include "src/__support/common.h" +#include "src/__support/libc_errno.h" +#include "src/__support/macros/config.h" +#include "src/__support/wchar/mbstate.h" +#include "src/__support/wchar/wcsnrtombs.h" + +namespace LIBC_NAMESPACE_DECL { + +LLVM_LIBC_FUNCTION(size_t, wcstombs, + (char *__restrict s, const wchar_t *__restrict wcs, + size_t n)) { + LIBC_CRASH_ON_NULLPTR(wcs); + static internal::mbstate internal_mbstate; + const wchar_t *wcs_ptr_copy = wcs; + auto result = + internal::wcsnrtombs(s, &wcs_ptr_copy, SIZE_MAX, n, &internal_mbstate); + if (!result.has_value()) { + libc_errno = result.error(); + return -1; + } + + return result.value(); +} + +} // namespace LIBC_NAMESPACE_DECL -- cgit v1.2.3